package cn.happy.day02;

public class Circle {
    public static void main(String[] args) {
        final Double PI = 3.14;
        Double area;
        Double radium = 1.5;
        area = PI * radium * radium;
        System.out.println("面积为："+area);
        int times= 10;
        Double ret=radium * times;
        System.out.println("结果:"+ret);
        double db1= 1;
        System.out.println(db1);
        Integer isij=1;
    }
}
